Metal spray gun



Oct. 10, 1933.

E. STUBENRAUCH METAL SPRAY GUN Filed April 1. 1952 if )0 A I 4 fivwsidwen mwcio INVENTOR ATTORN EYS Patented Oct. 10, 1933 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to torch heads or nozzles for guns or apparatus adapted for spraying or otherwise applying fusible materials or metals to surfaces and has for the primary object, the provision of a device of the above stated character which receives the material in solid form and readily fuses said material into a liquid state and acts upon the fused material by air pressure to efliciently break said material into small particles so that when directed onto a surface a coating will be formed which is compact and smoother than any metal spray coating heretofore applied and free of pores.

Another object of this invention is the provision of double jets for directing air under pressure to the material while being fused and in columns at an angle to each other and slightly in advance of one another to cause a thorough breaking up of said material so that the fused material will be ejected in a thoroughly mixed liquid state and thereby provide a coating to a surface having a much desired consistency not heretofore obtained from the well known types of guns and their nozzles.

With these and other objects in view, this invention consists in certain novel features of construction, combination and arrangement of parts to be hereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had to the following description and accompanying drawing, in which.

Figurel is a sectional view illustrating a torch head or nozzle constructed in accordance with my invention.

Figure 2 is a side elevation partly in section illustrating my invention applied to a conventional type of gun'or apparatus for fusing or spraying material or metal onto a surface.

Figure 3 is a fragmentary plan view illustrating the gun with the covers thereof removed.

Figure 4 is a detail sectional view illustrating a cap.

Figure 5 is a side elevation illustrating the nozzle.

Figure 6 is an end view illustrating the same.

Referring in detail to the drawing, the numeral 1 indicates a conventional type of spray gun having a torch head-or nozzle 2 applied thereto and constructed in accordance with my invention. The gun 1 receives the raw material through the member 3 and feeds said material into the nozzle or torch head for fusing and ejection therefrom in a liquid state under air pressure received from a suitable source. The gun does not form the subject-matter of the present application but is merely shown to illustrate the exact use of the torch head or nozzle.

A base 4 is carried by the gun 1 and has air and gas passages 5 and 6 which communicate with corresponding passages of the gun. The base 4 carries a material conveying element 7 receiving material from the gun in solid formation and directing said material through a tip 5 8 carried thereby. The base 4 is provided with a screw-threaded extension 9 to which a sleeve 10 is threaded and surrounds a portion of the element 7 and a portion of the tip 8 and has threaded thereto a gas nozzle 11 provided with 7 a conical shaped portion 12 disposed over and spaced slightly from the tip 8 and terminating flush with the end of said tip. The extension 9, sleeve 10 and gas nozzle 11 are spaced from the element '7 and tip 8 to form a gas or fuel passage 13 communicating at one end withthe gas passages 6 ofthe base 4.

A sleeve 14 is threaded to the base 4 and surrounds the sleeve 10 in spaced relation thereto to form an air passage 15 communicating at one end with the air passage 5 of the base. The sleeve 14 is provided with a screw-threaded extension 16 to which is threaded an air divider 17. The air divider 1'7 is provided with a conical shaped portion 18 disposed about the conical 5 shaped portion 12 of thegas nozzle and projects slightly beyond the end of the latter to form a combustion chamber 19. A conical shaped cap 20 surrounds the air divider and is threaded thereto and projects beyond the free end of the air divider to form a mixing chamber 21 and which also provides an escape for the fused material under air pressure. A plurality of ribs 22 are formed on the conical shaped portion of the air divider both upon the interior and exterior thereof to provide a series of passages for air to escape into the combustion chamber 19 and the mixing chamber 21. The air divider is provided with a series of ports 23 which permit the air pressure from the passage 15 to.l00 pass both on the inside and outside of the conical portion 18 of the air divider, thus it will be seen that columns of air may be introduced to the material while being fused in the combustion chamber and also while within the mixing chamber 21 so that said material Will be broken up into very small or fine particles and when ejected from the nozzle or torch head will provide a coating to a surface free of pores. The arrangement of the conical shaped por-.

tion of the air divider provides inner and outer columns of air 24 and 25 and which columns of air escape at an angle to each other and are directed into the combustion and mixing chambers 19 and 21, respectively. The air passing out of the combustion chamber 19 draws the fused material outwardly therefrom into the mixing chamber 21 and at the same time acting upon a said fused material. to break the same into small particles. As the fused material enters the mixing chamber 21 it is acted upon a second time by the column of air from the passages 25 to further break said material into very fine particles so that ,when escaping from the cap onto a surface, a coating will be formed of a proper consistency free of pores and may be evenly and smoothly applied to said'surface.

It is to be understood that the material or metal is fed through the passage of the element 7 from the gun and throughthe tip 8 where it is heated by the burning of the gases or fuel from the passage 13 within the combustion chamber 19. As the fused material forms within the combustion chamber it is acted upon by the air pressure in the manner heretofore described.

While I have shown and described the preferred embodiment of my invention, it will be understood that minor changes in construction, combination and arrangement of parts may be made without departing from the spirit and scope of my invention, as claimed.

Having thus described my invention, what I claim is:

A nozzle for spray guns comprising a base having air and fuel passages, a material conveying element carried by said base, a tip secured to said element to receive material therefrom and having a conical-shaped discharge end, a gas nozzle having a conical shaped portion disposed over and spaced from the conical discharge end to form a gas fuel passage discharge at the end of the tip, means connecting said nozzle to the base and connecting the last-named fuel passage with the fuel passage of the base, an air divider having a conical shaped portion disposed over and spaced from the conical-shaped portion of the IlO'TlG and projecting beyond the latter to form a combustion chamber at the ends of said nozzle and tip, said air divider having openings and provided with grooves in the outer face of the conical-shaped portion thereof, means connect ing said air divider to the base and directing air under pressure from the air passage of the base between the nozzle and the air divider into the combustion chamber and through the openings, and a conical-shaped cap disposed over and spaced from the air divider and having one end secured to the latter'and its opposite end projectbeyond the combustion chamber to form a mixing chamber receiving from the combustion chamber fused material and subjecting the latter to air under pressure received from the openings of the air divider.

ERNEST STUBENRAUCH. 

